html,body{
	margin: 0;
	width: 100%;
	height: 2000px;
}

.mask-div{
	width: 100%;
	height: 100%;
	background-color: black;
	opacity: 0.35;
	position: fixed;
	top: 0px;
	left: 0px;
	z-index: 5;
	
}
.mask-box{
	width:350px;
	height: 100px;
	
}


